74 research outputs found

    Makna Simbolik Randai sebagai Kesenian Masyarakat Minangkabau di Kota Payakumbuh Provinsi Sumatera Barat

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    Randai is one of traditional culture of Minangkabau people. There are symbolic aspect in art of randai with special meaning that is represented by clothing, musical instruments in art of randai, movements in randai. The purpose of this research was detemining the meaning of symbolic situation, the product of social interaction, and the interpretative of randai as art of Minangkabau people in Payakumbuh City.This research used qualitative methode by simbolic interaction approach. Informan of this research is randais trainer, randais playeras well as the figure of Minangkabau society who were selected by using purposive technique, and society in Payakumbuh City were selected by using accidental technique. Data collection technique used observation, interview and documentation.The result of research showed that symbolik situation meaning of randai as art of Minangkabau society in Payakumbuh City include physical objects such as costumes (Minangkabau costumes) and musical instrument in randai (Saluang, talempong, gandang, and bansi) with special meaning in every part while the social objects from art of randai include the movements of randais players (galombang dance and pencak silat), song on art of randai and social object based the message of randai which also has special meaning. The meaning of social products interaction includes the meaning of randai from the players side where the players interpret randai has culture and self protections value, from the trainers side randai has culture, religion, custom and art value, from the figure of Minangkabau peoples side randai has culture, history, unifying tool, custom, education, religion and art value and from Minangkabau peoples side randai has culture and art value. Interpretations meaning of randai include the closed action and the opened action. The closed action include internal and external motivation of randais players, and both of pleasure and proud to be a part of randai. The opened action of randais players include the expression of all players and the attitude of randais players who were always compact and have a good teamwork.Keyword: Symbolic Meaning, Randai, Symbolic Situation, The Product of Social Interaction, Interpretatio

    Evolution of form in metal-organic frameworks

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    Self-assembly has proven to be a widely successful synthetic strategy for functional materials, especially for metal-organic materials (MOMs), an emerging class of porous materials consisting of metal-organic frameworks (MOFs) and metal-organic polyhedra (MOPs). However, there are areas in MOM synthesis in which such self-assembly has not been fully utilized, such as controlling the interior of MOM crystals. Here we demonstrate sequential self-assembly strategy for synthesizing various forms of MOM crystals, including double-shell hollow MOMs, based on single-crystal to single-crystal transformation from MOP to MOF. Moreover, this synthetic strategy also yields other forms, such as solid, core-shell, double and triple matryoshka, and single-shell hollow MOMs, thereby exhibiting form evolution in MOMs. We anticipate that this synthetic approach might open up a new direction for the development of diverse forms in MOMs, with highly advanced areas such as sequential drug delivery/release and heterogeneous cascade catalysis targeted in the foreseeable future.ope

    Chemical diversity in a metal-organic framework revealed by fluorescence lifetime imaging

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    The presence and variation of chemical functionality and defects in crystalline materials, such as metal–organic frameworks (MOFs), have tremendous impact on their properties. Finding a means of identifying and characterizing this chemical diversity is an important ongoing challenge. This task is complicated by the characteristic problem of bulk measurements only giving a statistical average over an entire sample, leaving uncharacterized any diversity that might exist between crystallites or even within individual crystals. Here we show that by using fluorescence imaging and lifetime analysis, both the spatial arrangement of functionalities and the level of defects within a multivariable MOF crystal can be determined for the bulk as well as for the individual constituent crystals. We apply these methods to UiO-67, to study the incorporation of functional groups and their consequences on the structural features. We believe that the potential of the techniques presented here in uncovering chemical diversity in what is generally assumed to be homogeneous systems can provide a new level of understanding of materials properties

    Current trend in synthesis, Post-Synthetic modifications and biological applications of Nanometal-Organic frameworks (NMOFs)

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    Since the early reports of MOFs and their interesting properties, research involving these materials has grown wide in scope and applications. Various synthetic approaches have ensued in view of obtaining materials with optimised properties, the extensive scope of application spanning from energy, gas sorption, catalysis biological applications has meant exponentially evolved over the years. The far‐reaching synthetic and PSM approaches and porosity control possibilities have continued to serve as a motivation for research on these materials. With respect to the biological applications, MOFs have shown promise as good candidates in applications involving drug delivery, BioMOFs, sensing, imaging amongst others. Despite being a while away from successful entry into the market, observed results in sensing, drug delivery, and imaging put these materials on the spot light as candidates poised to usher in a revolution in biology. In this regard, this review article focuses current approaches in synthesis, post functionalization and biological applications of these materials with particular attention on drug delivery, imaging, sensing and BioMOFs

    Fe-Porphyrin-Based Metal–Organic Framework Films as High-Surface Concentration, Heterogeneous Catalysts for Electrochemical Reduction of CO<sub>2</sub>

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    Realization of heterogeneous electrochemical CO<sub>2</sub>-to-fuel conversion via molecular catalysis under high-flux conditions requires the assembly of large quantities of reactant-accessible catalysts on conductive surfaces. As a proof of principle, we demonstrate that electrophoretic deposition of thin films of an appropriately chosen metal–organic framework (MOF) material is an effective method for immobilizing the needed quantity of catalyst. For electrocatalytic CO<sub>2</sub> reduction, we used a material that contains functionalized Fe-porphyrins as catalytically competent, redox-conductive linkers. The approach yields a high effective surface coverage of electrochemically addressable catalytic sites (∼10<sup>15</sup> sites/cm<sup>2</sup>). The chemical products of the reduction, obtained with ∼100% Faradaic efficiency, are mixtures of CO and H<sub>2</sub>. These results validate the strategy of using MOF chemistry to obtain porous, electrode-immobilized, networks of molecular catalysts having competency for energy-relevant electrochemical reactions
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